This RV Propane Regulator allows you to connect 2 propane tanks at the same time and the regulator automatically switches over to the second tank once the first 1 runs out (and vice versa). The indicator changes color to let you know when a tank has been depleted and needs to be refilled, also remind you switching to the backup tank. The RV pigtail hose is made of durable stainless steel braided, with weather resistance, anti-aging, air tightness, heat-resistance and flexibility features. Auto-changeover LP regulator with 2 Stage design is suitable for RVs, trailers, Vans, camper grill, generator, patios, lawns and gardens, biogas tank links. Specification RV Propane Regulator: Primary Cylinder Capacity 210,000 BTU/hr, Reserve Cylinder 130,000 BTU/hr. Inlets: 1/4 in. SAE Inverted Flare. Outlet: 3/8 in. Female NPT. RV Pigtail Propane Hose: 1/4 in. Male Inverted Flare and QCC1 Fitting, 2PCS 18 in. Stainless Braided RV Pigtail Propane Hoses. Material: Metal.